Manufacturing method of wing nuts

ABSTRACT

A manufacturing method of wing nuts has a round metal wire cut into segments used as billets. The method includes a basic formation directly forging the billet to become a primary body consisting of an intermediate head and two curved wings connected with two ends of the intermediate head respectively, a wing trigging employed for forging the wings of the intermediate head to become butterfly wings with a curved edge and an edge formation effected by forging the intermediate head to form a positioning groove in the center of the top and the bottom side respectively. Then the semi-finished product is finished by drilling and threading. By this method, manufacturing processes can be shortened to obtain a rapid producing rate and lessen waste volume, lowering cost and advancing competition.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to a manufacturing method of wing nuts, particularly to one able to simplify and shorten the manufacturing process. The raw material is a round metal wire that is cut into segments used as billets. Automatically Forged by continuous steps of a basic formation, a wing trigging and an edge formation, a semi-finished product is obtained. Then the semi-finished product is finished with drilling and threading to become a final product. By this method, manufacturing process can be simplified and shortened to obtain a rapid producing rate and lessen waste volume, lowering cost and advancing competition.

2. Description of the Prior Art

The conventional engagement of a bolt and a nut is based on that of corresponding male threads and female threads. Commonly, such a nut is formed with two wings, called as a wing nut, so that it can be tightly fastened with or screwed off the bolt by a tool (such as a wrench). And the conventional wing nut is made by either casting or pressing.

In casting, the nut is made by pouring a molten metal in a sand mold. However, the procedures of casting include making a mold, melting a metal, casting and breaking the mold, constituting a complicated process. And unfortunately the finished product is always accompanied with a plurality of cavities, resulting in forming a rough surface, having a poor quality and an inclination of fracture.

In pressing, the nut is made by pressing and shearing a metal plate, posing a ragged edge to be apt to cut fingers and rather more metal waste to augment cost.

In order to improve the disadvantages mentioned above, a method of cold forging has been exploited to manufacture the wing nut, such as those disclosed in U.S. Pat. No. 1,395,762, ┌MANUFACTURE OF WING-NUT BLANKS┘, and No. 6,893,354, ┌METHOD FOR MANUFACTURING COLD-FORGED WING NUTS┘.

In No. 1,395,762, a metal rod is first extended to form as a billet, which is then cut, drilled and threaded. The disadvantages are described below.

(A) When the billet is cut, more waste is to be produced between wings of two adjacent nuts.

(B) Two wings of the nut are to have a ragged surface possible to cut fingers if not done with a secondary processing. However, secondary processing is to raise cost because of an extension of manufacturing process.

As for No. 6,893,354, its disadvantages are described below.

(A) As a round metal rod is used as raw material, it needs to be firstly compressed to form a shape having a thick, flat and round intermediate portion and two long side portions. Before becoming a billet, it has to be sheared. Then two sides of the round intermediate portion of the billet are extruded inwards to form a chamfer-angled groove, with the circumference of the groove lengthily forged outwards. A primary body is thus finished. Next, the primary body is drilled to have through hole. Finally, the two long side portions are forged by a module to curve upwards and get widened gradually as a butterfly wing. However, such a manufacturing process is so complicated that producing effect is unable to be raised.

(B) As mentioned previously, the method needs six steps and diverse devices to enable a round metal rod made into wing nuts, taking a long manufacturing time and increasing cost.

SUMMARY OF THE INVENTION

The object of this invention is to offer a manufacturing method of wing nuts.

The method uses a round metal wire as a raw material, which is cut into segments used as billets. The method includes a basic formation directly forging the billet to become a primary body consisting of an intermediate head and two curved wings connected with two ends of the intermediate head respectively, a wing trigging employed for forging the wings of the intermediate head to become butterfly wings with a curved edge, and an edge formation effected by forging the intermediate head to form a positioning groove in the center of the top and the bottom side respectively. Then the semi-finished product is finished by drilling and threading.

Further a step of a primary wing trigging is added between the steps of the basic formation and the wing trigging, utilized to forge the wings of the primary body to achieve a primary micro trigging, so that a curved edge of the wings can be gradually obtained with more perfection.

BRIEF DESCRIPTION OF DRAWINGS

This invention is better understood by referring to the accompanying drawings, wherein:

FIG. 1 is a flow chart of a first preferred embodiment of a manufacturing method of wing nuts in the present invention;

FIG. 2 is a flow chart of a side view of a wing nut manufactured by the method of the first embodiment of the present invention in FIG. 1;

FIG. 3 is a flow chart of a top view of the wing nut manufactured by the method of the first embodiment of the present invention in FIG. 1;

FIG. 4 is a flow chart of a second preferred embodiment of a manufacturing method of wing nuts in the present invention; and

FIG. 5 is a flow chart of a side view of a wing nut manufactured by the method of the second embodiment of the present invention in FIG. 4.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

FIG. 1 shows a flowchart of a first preferred embodiment of a manufacturing method of wing nuts in the present invention. The method includes cutting a round metal wire into segments used as billets (1), and taking advantage of a special cold forging machine to directly forge the billet to become a semi-finished product by simplified steps of a basic formation (10), a wing trigging (20) and an edge formation (30). The semi-finished product is then automatically done with a drilling (40) and a threading (50) to become a final product.

FIGS. 2 and 3 show a wing nut made by the steps of the manufacturing method.

In the step of the basic formation (10), the billet (1) is directly forged to become a primary body (2) by means of a basic wing nut mold. The primary body (2) consists of an intermediate head (21) and two curved wings (22) connected with two ends of the intermediate head (21) respectively. The primary body (2) is removed to next stage by a clamp.

In the step of the wing trigging (20), the two wings (22) of the primary body (2) are forged to become a butterfly wing with a curved edge (221) by means of a curve-trigging mold. The primary body (2) is removed to next stage by a clamp.

In the step of the edge formation (30), the intermediate head (21) of the primary body (2) is forged to form a positioning groove (211) in the center of the top and the bottom side respectively. The primary body (2) is then moved to next stage by a clamp.

After simply treated by the three steps described above, the semi-finished primary body (2) is successively fixed in a positioning module in the step of the drilling (40), with the positioning grooves (211) centered to carry out drilling so as to gain a through hole (23) that is further done with the threading (50). The wing nut is thus finished, ready to engage with a bolt. With the metal wire cut into segments used as billets (1) and a short continuous automatic cold forging, the wing nut of the invention can be swiftly manufactured on a mass scale, advancing economic effect and strengthening competitiveness.

FIGS. 4 and 5 show a second preferred embodiment of a manufacturing method of wing nuts in the present invention. A step of a primary wing trigging (20A) is added between the steps of the basic formation (10) and the wing trigging (20) of the first embodiment, utilizing a wing micro trigging module to forge the wings (22) of a primary body (2) to achieve a primary micro trigging. That is, forged by the two consecutive steps of the primary wing trigging (20A) and the wing trigging (20), the curved edge (221) of the wings can be gradually obtained with more perfection.

The invention has the following advantages as can be seen from the foresaid description.

1. With simple steps of the basic formation (10), the wing trigging (20) and the edge formation (30) in the invention, a wing nut can be manufactured more easily than by the conventional methods needing complicated processes. Compared with the conventional methods, the methods according to the invention not only use less devices to save costs of hardware and maintenance, but also shorten process to get a more rapid producing speed.

2. With a simplified process as described above, the methods according to the invention can shorten manufacturing time to essentially achieve a mass production for advancing marketing competition.

While the preferred embodiment of the invention has been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to cover all such modifications that may fall within the spirit and scope of the invention. 

1. A manufacturing method of wing nuts, said method comprising: a basic formation utilizing a billet cut from a round metal wire to create a primary body by being directly forged by a basic wing nut mold, said primary body consisting of an intermediate head and two curved wings connected with two ends of said intermediate head respectively; a wing trigging employed for forging two said wings of said primary body to become butterfly wings with a curved edge by means of a curve-trigging mold; an edge formation effected by forging said intermediate head of said primary body to form a positioning groove in a center of a top and a bottom side of said intermediate head respectively; and a drilling done in a center of said positioning groove of said intermediate head to create a through hole that is further threaded.
 2. The manufacturing method of wing nuts as claimed in claim 1, wherein a step of a primary wing trigging is added between the steps of said basic formation and said wing trigging and utilizes a wing micro trigging module to forge said wings of said primary body to achieve a primary micro trigging. 